Electric drive for hoisting and boom-lifting drums.



A. LAMBERT. ELECTRIC DRIVE FOB'HOISTING AND BOOM LIFTING DRUMS.

I APPLICATION FILED APR. 29, |9|5\ 1,181,322, Patented May 2, 1916.

2 SHEETS-SHEET 1.

A. LAMBERT. ELECTRIC DRIVE FOR HOISTING AND BOOM LIFTINGD DRUMS.

. APPLICATION FILED APR- 29. 1915- 1,181,322.

Patented May 2, 1916.

2 SHEETSSHEET 2.

ASHER LAMBERT, OF NEWARK, NEW JERSEY.

ELECTRIC DRIVE FOR li0ISTING AND BOOM-LIFTING- DRUMS.

Patented May 2, 191%,

Application filed April 29, 1915. Serial No. 24,683.

To all whom it'may concern:

Be it known that I, ASHER LAMBERT, a citizen of the United States, residing at 1 Johnson avenue, Newark, countyof Essex, and State of New Jersey, have invented certain new and useful Improvements in Elec- I tric Drive for Hoisting and Boom-Lifting Drums, fully described and represented in the'following specification and the accompanying drawings, forming a part of the same.

This invention relates to a three-drum hoisting-machine for excavating with a clam-shell bucket which can be opened and closed by two ropes connected to separate drums. One of such drums requires much more" power than the other, as it is used to close the bucket and hoist the same with its load, while the other drum' is employed to open and dump the bucket. The third drum in the hoister requires more power than any of the others'when it is used to raise and lower the boom which carries the bucketropes and theloadedL bucket. The drums in such a machinemay be otherwise used but, i

for convenience, the three will be referred to herein as the boom-drum, the hoistingdrum and the dumping-drum.

It is the object of the present invention to obviate some of the frictional losses in such a hoister by locating an electric motor on' a bridge. connecting the sidedrames with its 1 armature-shaft between two of the drums, and meshing its pinion directly with spurgears upon those drums, thus operating to rotate them in the same direction; direct gearing also being furnished to connect the third drum with one of the two, and oper-,

ating to rotate such third drum in a direction opposite to the others. This arrangement of the motor and its shaft avoids the use ofany intermediate gear whatever between the pinion and the gearrfor either of the drums which uses much power.

To relieve the motor-bearings from the strain exerted by the pinion, the armaturespindle is provided (outside of the pinion) with a bearing upon the frame of the bed,

thus supporting the pinion firmly and avoiding wear of the armature-bearings.

It is very desirable that the motor-spindle should not be reversed by the pull upon the ropes when the current is cut on fromthe motor to stop the drinn; and to prevent such a reversal oi the armature-spindle, it is provided with a brake-wheel having a strap operated by a tension-lever and so constructed as to permit the free rotation of the armature-spindle during the hoisting.

operation, but operating positively and automatically to'arrest thesame when the current is cut ofi from the motor.

The invention will be understood by refthe crossbars of a bed, which carries upon each of the side-frames bearings c, d and e for the drum-shafts f, g and h of the boomdrum f, the hoisting-drum g and the dumping-drum h. The shafts f and g are provided with spur-gears 0 and d, and the shafts are spaced apart so that there is room between the adjacent edges of the spur-gears for the pinion 21 upon the armature-spindlej of the motor 70. The spur-gears c and d are made very large relatively to the pinion so as to sufhciently reduce the speed of the drums in such a direct connection to the armature-spindle. The spur gears c and d are secured to their shafts close to the bearings 0 and a7 upon the side-frame a, and a bearing Z is provided upon the same sideframe for the armature-spindle 3', upon the outer side of the pinion i.

The motor is mounted upon a bridge m extended between the side-frames a, a, and a brake-wheel n is attached to the armaturespindle at the end opposite that which carries the pinion. The strap 71/ for the brakewheel 11. is shown in Fig. 2, the brake-wheel which remains loose aswell as thespindle,

when turning in its working direction,

which is effected without any strain or fricout the other end, thus producing an auto matic tightening of the strap if the brakewheel n of Fig. lattempts to turn in a direction reverse to its normal movement. The automatic braking of the armaturespindle serves to prevent the rope-drums from turnin'g bac'lfward so long as they are connected with their friction-drivers 7).

Ropes F and G are shown extended in a slanting direction from the upper sides of the drums f and g, and a rope H extended from the under side of the drum 7a., and such ropes may be extended upward to an elevated point upon the post of a derrick, where they may be guided over pulleys to raise and lower the boom or the bucket. The rope F is thus arranged to clear the top of the motor is, the spindle ofwhich is shown setuponthe same level as the drumshaft 7, but where it is desired to carry the ropes to the foot of the derrick-post, the bearing act the drum i may be made higher, so that the rope F maypass horizontally over the top of the motor.

The shaft h of the dumping-drum it is shown provided with a spur-gear e, and a similar spur-gear e is attached to the shaft 9 of the drum 9', the twogears. meshing d1 rectly so that these two drums turn in opposite directions, but at exactly the same speed.

In a three-drum hoister where the dumping-drum 71. operates in conjunction with the hoisting-drum g to first close and raise the bucket with a load and then to open and dump the bucket, it is absolutely necessary that the surface-speed of the two drums should bethe same, so that during the hoisting operation the dumping-rope may be wound up simultaneously with the hoistingrope so as to hold the bucket closed until it requires dumping. A

A, pair of equal spur-gears e ande is shown in Fig. '2 for connecting the shafts of p the hoisting'and dumping-drums, which are shown of'the same diameter and must therefore be rotated at exactly the same speed; and such identity of speed could not be secured by connection to the spur-gear 03 without providing the shaft in with an equally large spur-gear; which would crowd the drums g and it a great distance apart and unnecessarily lengthen the bed of the entire hoister. For that reason, a pair of smaller spur-gears e and e is employed; but where the speed of the drum it permits,

its spur-gear e may be meshed directly with the gear 03', as shown in Fig. 3. Such an arrangement increases the speed of the drum it, but the same may be made smaller, as shown in'Fig. 3', to equalize its rope-delivery more nearly with that of the drum 9.

As the drums g and It" revolve in opposite directions, the ropes G and H may be made to hoist or lower simultaneously by winding them upon their drums in opposite directions, as shown in Fig.1; the rope G running from-the top of the drum 9, and

the rope H running from the bottom of the drum it.

It will be understood that the connection between the shafts'g and it is equally'direct whetherthe spur-gear e is employed asin Fig. 2, or omitted as in Fig. 3; because the friction in either case is merely that of one spur-gear running into another.

The drums f and g are provided with brake-wheels f? and g and the drum 7:. with a brake-wheel 72. the straps for such brakes being shown in Fig. 1.' The levers of these brake-straps are controlled solely by the operator. r

Each of the drums is mounted to turn loosely upon its shaft, and is provided with a hollow cone 0 adjacent to its, spur drivinggear, which latter is provided with awooden friction-cone p to fit the hollow. cone. A

thrust-screw q is provided for each drum.

i has an equally direct connection with the gears c and a? of the drums and g,which wholly avoids the use of any intermediate gears in thetransmission of power to the two drums which require the greatest amount of power in the operation of the hoister.

The shaft of the drum it is driven by a direct connection to the shaft 9 of the drum 9, and is thus driven with only a single intermediate, represented by the spur-gear d or 6. I

The present improvements are-simple in their nature and economical i iconstruction, and add materially to the eflii'e iency of the three-drum hoister; Y

Having thus set forth the nature of the invention what is claimed herein is:

In a three-drum hoisting machine, the combination, as herein described, of a bed having side-frames, and bearings upon the same for the shafts of three drums, drums mounted upon shafts in the bearings, two adjacent drums having spur-gears with their edges a little distance apart, a bridge connecting the side-frames between the said two drums, an electric motor mounted upon the bridge with its armature-shaft extended over'one of the said frames, and provided with a bearing thereon, and having a pinion between the said bearing and the motor,

gears simultaneously in the same direction,

during the normal rotation of the motorshaft, and operating to positively prevent the reversal of such motor-shaft. 10

In testimony whereof I have hereunto set my hand.

ASHER LAMBERT. 

